package com.stillalive.springbootbooksystem.interceptor;
import com.stillalive.springbootbooksystem.Model.UserInfo;
import com.stillalive.springbootbooksystem.constant.Constants;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
@Slf4j
@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("preHandle...");
        // 未登录的话就不创建新的session
        HttpSession session = request.getSession(false);
        if(!checkUser(session)){
            // 用户未登录，返回false
            // 设置响应状态码，401（用户未登录）
            response.setStatus(401);
            response.setContentType("text/html;charset=utf-8");
            String msg = "用户未登录";
            response.getOutputStream().write(msg.getBytes("UTF-8"));
            return false;
        }
        // true 放行，false 拦截
        return true;
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        log.info("postHandle...");
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        log.info("afterCompletion...");
    }

    public boolean checkUser(HttpSession session){
        if(session == null || session.getAttribute(Constants.SESSION_USER_KEY) == null){
            log.warn("用户未登录");
            // 用户未登录
            return false;
        }
        UserInfo userInfo = (UserInfo)session.getAttribute(Constants.SESSION_USER_KEY);
        if(userInfo == null || userInfo.getId() <= 0){
            log.warn("登录信息有误");
            // 用户未登录
            return false;
        }
        log.info("用户已登录");
        return true;
    }
}
